I have a 102 in my driveway and am perplexed at the function of this device. The brass plugs are dead center just below the windscreen on about the same level as the wipers.

I've asked around a bit. Some folks (no names mentioned) thought it was an attachment point for a moose lure. The most plausible answer seemed to be it was a plug for where the door release would be on an MC8.

I tried removing it but the plug is 19/32 or some such, not a standard SAE or Metric wrench.

On this rig, the valve for emergency air to release the brakes is located in the bottom door which is the windshield washer fluid / horn compartment. However I was concerned about it being air as well. LoL.

Ever watch a Looney Toon's cartoon where the protagonist (Bugg's Bunny) looesns a single bolt on any vehicle (a bulldozer comes to mind) and the whole thing falls apart? Well guess what you found! From now on, that bolt shall be technically referred to as the "Bugg's Bolt".

Ever watch a Looney Toon's cartoon where the protagonist (Bugg's Bunny) looesns a single bolt on any vehicle (a bulldozer comes to mind) and the whole thing falls apart? Well guess what you found! From now on, that bolt shall be technically referred to as the "Bugg's Bolt".

Glenn

GADZOOKS! I didn't know MCI was a subsidiary of the ACME company! I feel like a macaroon.

Does your MCI's front door open by a toggling a switch on the dashboard?

If so, the mystery of the "Bus Bolt" is now solved!

On the "A" series coaches that had a manually operated door mechanism, there was a "T" handle that came out thru that spot to release the mechanism from outside. Similar to the plunger on the front of earlier MCIs (GMC's too, for that matter.)